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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9f6d838f54eadf6b136e25c0550c833aab650367cb66a687b7cbab7deaf8ab' 
  AND token = 'Mmvee0oKS0+gmhHimyOZDPf6V1KSEjhy19dLgXOxT78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}